P2197 What does this mean

P2197 - Lack of HO2S-21 Switch, Sensor Indicates Lean
A Heated Oxygen (HO2S) sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time. See the possible causes for DTC P2195.

http://www.obd-codes.com/p2270


http://www.obd-codes.com/p2197

The four digit codes are brand specific, but in general, the three codes mean the fuel system is too lean.
The most common cause is low fuel pressure.

P0113 IAT sensor circuit high voltage
p0118 ECT (coolant sensor)
p2195 AF sensor signal stuck lean

P2197 is model specific and I don't have the info for your model.
For some Ford products it is for a lean O2 sensor.
If that injector is dead it could cause the code.
A lean O2 code does not always mean the sensor is bad, but that the reading the computer is getting is out of normal range.

this obd2 trouble code table can help you....

This code means that the O2 sensor is bad. It is the first O2 sensor on the second bank of the engine. It is stuck on a Lean setting and needs to be replaced.

P2195 and P2197 means that the O2 sensors on each bank are seeing WAY too much oxygen in the exhaust gas. In normal operation the signal from the O2 sensors should swing back and forth between rich and lean... Your sensors are locked on lean. Replace both O2 sensor.

Hope helps (remember rated this).

Here it goes.
P2197 - Front Air Fuel Sensor (O2 sensor) Bank 2 - Sensor 1 Signal stuck lean.

P0154 - Front Air Fuel Sensor (O2 Sensor) Bank 2 - Sensor 1 Heater System Malfunction.

P2254 - Front AIr Fuel Sensor (O2 Sensor) VS Line high voltage.

IF Trouble codes P0134 or P0154 are present diagnose them before code P2254.

The first thing I would do would be check the heater circuit. You will have ground, and 12V+ to the 02 sensor heater line on a cold start. This heats up the oxygen quicker and allows it to operate in the correct amount of time. 9/10 times if there is a heater circuit code it is the oxygen sensor. But 1/10 times it is a blown fuse. So checking the voltage at the sensor is a quick test for P0154.

I would backprobe the signal line when the vehicle is at a full operating temp with a graphing meter (if avail) or use a DVOM. You should see it switch between .1 volts to 1V. It should not continuously move up and down. This indicates the computer is in good fuel control.

Diaginosis the heater circuit first is best because code P2197 can be set from anything that can cause that motor to run lean. (Plugged fuel filter, low fuel pressure/volume, vacume leak).

Hope this gives you a solid path to go on & good luck.

The code reads to much air flow,pcv valve area,or internal engine leak.Replace the pcv valve,and make sure the hose going to it is in good shape.